Human beings, by their very nature, are a restless species. You look at orang-utans or pandas and they seem content to wake up, eat, potter about a bit, eat some more, nap, eat and then sleep for 12 hours. Sounds pretty good, right? Not for some, such as the sort of people who love being thrown out of planes, hanging from bits of elastic, riding powerful machines at eye-watering speeds and taking particular enjoyment from sports that are prefixed by the letter X and are invariably sponsored by Red Bull. No, for these people, a cup of tea and the Sunday newspapers is not enough. Luckily for them, the watch industry has heard their call and manufactured a slew of watches to keep pace with this generation of adrenaline junkies. A watch doesn't get more extreme than the Alpina Extreme Tourbillon Regulator Manufacture (below right), and only partly because it has the word 'extreme' in its name. First released in 2009 as an all-black version, the latest model has been given an extreme makeover, if you will. Re-released in two designs - one of which is made of titanium and sports a rose-gold bezel the other is made from rose gold and has a black ceramic bezel - both have a limited run of 18 numbered pieces. Priced at HK$328,000, the latest Extreme Tourbillon Regulator Manufacture is as robust as a luxury watch gets, with a huge 48mm case. Alpina is a sports watch brand and the Extreme Tourbillon Regulator Manufacture is built for active use with emphasis on readability, as evidenced by the oversized numerals. The very notion of having an immensely complicated tourbillon mechanism inside a sports watch is ambitious but the case itself as well as the tourbillon complication is shock resistant, with the expectation being that the wearer will be getting some knocks and bangs. Sometimes associating yourself with extreme sports is enough to lend your brand that dangerous edge and that's the path Tissot has taken with the T-Race MotoGP Limited Edition 2011 (above). The brand has been the official timekeeper of the MotoGP world championships, the pinnacle of motorcycle racing, for a number of years now and the association has spawned a watch that captures the thrills and spills of racing. The most arresting thing about this watch is the colour scheme, which Tissot describes as 'high octane'. Right. It's very orange, though, and the 'high octane' strap works well with the black carbon dial and stainless-steel case. The GMT rotating bezel is shaped like a bike brake disc and there is a MotoGP logo on the case back. Racing features include a tachymeter and three chronograph subdials. Costing a shade over HK$6,000, the Tissot T-Race MotoGP Limited Edition 2011 is limited to a very neat and not very extreme 8,888 pieces. When one thinks of extremes, one thinks about inhospitable environments and one person who was in his element in such, well, elements, was Jacques Cousteau, the man who popularised diving with his seminal television shows and documentaries. Last year, to celebrate what would have been Cousteau's 100 birthday, IWC released the Aquatimer Chronograph Jacques Cousteau Divers (below) in tribute to the Frenchman. Retailing for HK$52,000, the timepiece is aimed at accomplished divers, with the 44mm stainless-steel case water resistant to 120 metres, black rubber strap, anti-glare glass and numerals coated in Super LumiNova to enhance underwater readability, even during night dives. The slate-coloured dial features blue totalisers and has the nice touch of Cousteau's signature. Classier still, the back of the watch has a portrait engraving of the explorer.